btnClick(eleRef) {
      let result = this.test();
      this.$alert(result);
    },
    test(){
      let flag = false;
      let arr=[{title:0},{title:1},{title:2},{title:3},{title:4}];
      arr.map(one => {
        if(one.title == 2){
          flag = true;
          console.log('one.title == 2');
          return one;
        }
      })
      if(!flag){
        return -1;
      }
    },

以上代码运行结果，一直返回空。

以下代码，则能正常返回期望结果

btnClick(eleRef) {
      let result = this.test();
      this.$alert(result);
    },
    test(){
      let arr=[{title:0},{title:1},{title:2},{title:3},{title:4}];
      let result = -1;
      arr.map(one => {
        if(one.title == 2){
          result = one.title;
        }
      })
        return result;
    },

返回结果：